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You found a .mid file — a MIDI file using the shorter, three-character extension that was standard on older systems with filename length limits. It's identical to .midi in every way. The file contains musical instructions, not audio: which notes to play, when, how hard, and on which instrument channel.
The .mid extension was more common than .midi in the early days of personal computing because DOS and Windows 3.1 only supported 8.3 filenames (eight characters, dot, three-character extension). Most MIDI files from the karaoke era, early web, and video game soundtracks use .mid. Modern systems handle both extensions identically.
Every operating system can play .mid files using built-in synthesizers — the quality varies dramatically depending on the sound bank. For better playback, open in a DAW (GarageBand, Ableton, FL Studio) and assign proper virtual instruments. MIDI files are tiny (a few KB) and endlessly re-arrangeable, which is why they're still used in music production, education, and game audio.